package cn.wolf.rpc.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

public class NettyServer {

    public static void startServer(String hostName, int port) {
        startServer0(hostName, port);
    }

    /**
     * NettyServer的初始化和启动
     *
     * @param hostname 主机地址
     * @param port     端口号
     */
    private static void startServer0(String hostname, int port) {

        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ChannelInitializer<SocketChannel>() {
                           @Override
                           protected void initChannel(SocketChannel ch) throws Exception {
                               ChannelPipeline pipeline = ch.pipeline();
                               //添加string 类型的编码和解码器
                               pipeline.addLast(new StringDecoder());
                               pipeline.addLast(new StringEncoder());
                               //添加自定义业务处理器
                               pipeline.addLast(new NettyServerHandler());
                           }
                       }
                    );
            ChannelFuture channelFuture = serverBootstrap.bind(hostname, port).sync();
            System.out.println("服务提供方开始提供服务~~");
            channelFuture.channel().closeFuture().sync();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}
